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# canonicalize.m4 serial 37
dnl Copyright (C) 2003-2007, 2009-2022 Free Software Foundation, Inc.
dnl This file is free software; the Free Software Foundation
dnl gives unlimited permission to copy and/or distribute it,
dnl with or without modifications, as long as this notice is preserved.
# Provides canonicalize_file_name and canonicalize_filename_mode, but does
# not provide or fix realpath.
AC_DEFUN([gl_FUNC_CANONICALIZE_FILENAME_MODE],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
if test $ac_cv_func_canonicalize_file_name = no; then
HAVE_CANONICALIZE_FILE_NAME=0
else
case "$gl_cv_func_realpath_works" in
*yes) ;;
*) REPLACE_CANONICALIZE_FILE_NAME=1 ;;
esac
fi
])
# Provides canonicalize_file_name and realpath.
AC_DEFUN([gl_CANONICALIZE_LGPL],
[
AC_REQUIRE([gl_STDLIB_H_DEFAULTS])
AC_REQUIRE([gl_CANONICALIZE_LGPL_SEPARATE])
if test $ac_cv_func_canonicalize_file_name = no; then
HAVE_CANONICALIZE_FILE_NAME=0
if test $ac_cv_func_realpath = no; then
HAVE_REALPATH=0
else
case "$gl_cv_func_realpath_works" in
*yes) ;;
*) REPLACE_REALPATH=1 ;;
esac
fi
else
case "$gl_cv_func_realpath_works" in
*yes)
;;
*)
REPLACE_CANONICALIZE_FILE_NAME=1
REPLACE_REALPATH=1
;;
esac
fi
])
# Like gl_CANONICALIZE_LGPL, except prepare for separate compilation
# (no REPLACE_CANONICALIZE_FILE_NAME, no REPLACE_REALPATH, no AC_LIBOBJ).
AC_DEFUN([gl_CANONICALIZE_LGPL_SEPARATE],
[
AC_REQUIRE([gl_USE_SYSTEM_EXTENSIONS])
AC_REQUIRE([gl_FUNC_LSTAT_FOLLOWS_SLASHED_SYMLINK])
AC_CHECK_FUNCS_ONCE([canonicalize_file_name faccessat])
dnl On native Windows, we use _getcwd(), regardless whether getcwd() is
dnl available through the linker option '-loldnames'.
AC_REQUIRE([AC_CANONICAL_HOST])
case "$host_os" in
mingw*) ;;
*) AC_CHECK_FUNCS([getcwd]) ;;
esac
AC_REQUIRE([gl_DOUBLE_SLASH_ROOT])
AC_REQUIRE([gl_FUNC_REALPATH_WORKS])
AC_CHECK_HEADERS_ONCE([sys/param.h])
])
# Check whether realpath works. Assume that if a platform has both
# realpath and canonicalize_file_name, but the former is broken, then
# so is the latter.
AC_DEFUN([gl_FUNC_REALPATH_WORKS],
[
AC_CHECK_FUNCS_ONCE([realpath lstat])
AC_REQUIRE([AC_CANONICAL_HOST]) dnl for cross-compiles
AC_CACHE_CHECK([whether realpath works], [gl_cv_func_realpath_works], [
rm -rf conftest.a conftest.d
touch conftest.a
# Assume that if we have lstat, we can also check symlinks.
if test $ac_cv_func_lstat = yes; then
ln -s conftest.a conftest.l
fi
mkdir conftest.d
AC_RUN_IFELSE([
AC_LANG_PROGRAM([[
]GL_NOCRASH[
#include <errno.h>
#include <stdlib.h>
#include <string.h>
]], [[
int result = 0;
/* This test fails on Solaris 10. */
{
char *name = realpath ("conftest.a", NULL);
if (!(name && *name == '/'))
result |= 1;
free (name);
}
/* This test fails on older versions of Cygwin. */
{
char *name = realpath ("conftest.b/../conftest.a", NULL);
if (name != NULL)
result |= 2;
free (name);
}
/* This test fails on Cygwin 2.9. */
#if HAVE_LSTAT
{
char *name = realpath ("conftest.l/../conftest.a", NULL);
if (name != NULL || errno != ENOTDIR)
result |= 4;
free (name);
}
#endif
/* This test fails on Mac OS X 10.13, OpenBSD 6.0. */
{
char *name = realpath ("conftest.a/", NULL);
if (name != NULL)
result |= 8;
free (name);
}
/* This test fails on AIX 7, Solaris 10. */
{
char *name1 = realpath (".", NULL);
char *name2 = realpath ("conftest.d//./..", NULL);
if (! name1 || ! name2 || strcmp (name1, name2))
result |= 16;
free (name1);
free (name2);
}
#ifdef __linux__
/* On Linux, // is the same as /. See also double-slash-root.m4.
realpath() should respect this.
This test fails on musl libc 1.2.2. */
{
char *name = realpath ("//", NULL);
if (! name || strcmp (name, "/"))
result |= 32;
free (name);
}
#endif
return result;
]])
],
[gl_cv_func_realpath_works=yes],
[case $? in
32) gl_cv_func_realpath_works=nearly ;;
*) gl_cv_func_realpath_works=no ;;
esac
],
[case "$host_os" in
# Guess yes on glibc systems.
*-gnu* | gnu*) gl_cv_func_realpath_works="guessing yes" ;;
# Guess 'nearly' on musl systems.
*-musl*) gl_cv_func_realpath_works="guessing nearly" ;;
# Guess no on Cygwin.
cygwin*) gl_cv_func_realpath_works="guessing no" ;;
# Guess no on native Windows.
mingw*) gl_cv_func_realpath_works="guessing no" ;;
# If we don't know, obey --enable-cross-guesses.
*) gl_cv_func_realpath_works="$gl_cross_guess_normal" ;;
esac
])
rm -rf conftest.a conftest.l conftest.d
])
case "$gl_cv_func_realpath_works" in
*yes)
AC_DEFINE([FUNC_REALPATH_WORKS], [1],
[Define to 1 if realpath() can malloc memory, always gives an absolute path, and handles leading slashes and a trailing slash correctly.])
;;
*nearly)
AC_DEFINE([FUNC_REALPATH_NEARLY_WORKS], [1],
[Define to 1 if realpath() can malloc memory, always gives an absolute path, and handles a trailing slash correctly.])
;;
esac
])
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